Kjoy.] 



Svcamork Lkaf Hlok II. 



107 



leaf surface is prevented from doing its work ; and, in addition, 

 diseased leaves fall early in the season. As the disease, unless 

 checked, continues from year to year, the tree becomes en- 

 feebled through lack of food, and then becomes an easy prey 

 to a yet more destructive parasite, the Coral spot fungus 

 (Ncctria cinnabarina) ,* which almost invariably follows an 

 epidemic of leaf blotch. The method for preventing a con- 

 tinuance of this disease is both simple and effective. The 



\ 



Rkytisma aeeruwm on sycamore. 



only possible means of infection of the young leaves in spring 

 1- from floating spores that have escaped from dead leaves 

 which have been lying on the ground during the winter. If 

 all such dead leaves are collected and burned before the young 

 leaves unfold, the disease will be arrested. 



• Leaflet No. 115 (Coral Spot Disease). 



